Malicious PDF — malware analysis report

Static analysis result for SHA-256 67cf69990b96b4ce…

MALICIOUS

PDF

71.8 KB Created: 2021-10-03 20:52:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 64691719cb7457ad49450b508a98d649 SHA-1: da6113d077ef2dd455adeb6d522b87ea63499297 SHA-256: 67cf69990b96b4ce327e5e5a1222336faefbaab7383951b324a673d620ef87dd
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised CMS upload storage or disposable hosting, indicative of a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to phishing or malware sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://krisoc.ru/uplcv?utm_term=divinity+original+sin+2+couch+co+op+xbox+one PDF link annotation
    • http://machinegroup.ru/img/outer/files/vinudabipumiso.pdfIn PDF document text
    • http://baiduvpn.com/upload/files/40906592097.pdfIn PDF document text
    • https://peperita.it/writable/public/userfiles/file/sagupakikomigigu.pdfIn PDF document text
    • http://www.addvanceo.info/userfiles/files/73224438226.pdfIn PDF document text
    • https://prestinireedcorp.com/userfiles/files/14367014500.pdfIn PDF document text
    • http://due.pt/js/ckfinder/userfiles/files/37866984412.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/1614c2cdd5bb93---17255395944.pdfIn PDF document text
    • http://cappellastudio.it/userfiles/files/rapazu.pdfIn PDF document text
    • http://tpdw.pl/userfiles/file/98578442006.pdfIn PDF document text
    • https://dbmotorbrokers.com/userfiles/file/29100082629.pdfIn PDF document text
    • https://rmduncanrealty.com/userfiles/files/vivofawezivubepexudajeti.pdfIn PDF document text
    • https://sme.bankai.lv/ckfinder/userfiles/files/noromipavom.pdfIn PDF document text
    • https://nada70.org/userfiles/file/womosarapoluv.pdfIn PDF document text
    • http://tiszaikaland.hu/upload/file/89390814920.pdfIn PDF document text
    • http://softtox.com/new/userfiles/file/26171974994.pdfIn PDF document text
    • http://zoltysnieg.pl/pliki_wyswig/files/34178316357.pdfIn PDF document text
    • https://moraure.net/js/ckfinder/userfiles/files/wifukulidizines.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614c2dda85199---sepogisemujakepemugi.pdfIn PDF document text
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/d87380f9d01b7e63da12fb5e962fed86/fugagopew.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a6ea4ed615---20305482489.pdfIn PDF document text
    • https://oolong-dining-co.com/webroot/editor-uploads/files/nowatimuvoxatosometimiwef.pdfIn PDF document text
    • https://hunghiephuylog.com/upload/files/39496676638.pdfIn PDF document text
    • https://dunakanyarfesto.hu/ckfinder/userfiles/files/sowafumomu.pdfIn PDF document text
    • http://abwplazaview.com/uploads/files/petibep.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b49a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB49A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ccac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCAC 16672 bytes
SHA-256: be61d6441fa2fea6b3859343dc787b0c1cdab9e191ef3d731fcb20032e97c786
font_02_sfnt_off0000f6c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6C5 11296 bytes
SHA-256: fe14489124a4450f6fcd0f42b81c5b88ffbb2bff120e49ad339bb8cf4dfcc8bc

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